do you own a 3500 reg cab ram dually

I would check local Gov and utility company auctions if you decide to move forward with the regular cab. Lots of reg cab duallys around here if you can take the plain vanilla ones.
I would suspect the reg cab long beds would ride just like the extra cab short beds. Keep the tires down at 60 when not towing and you should be good to go. I take it you have no kids still at home or pets?